Abstract: A method and system for determining the lateral position of an edge of a web are disclosed. The system includes an array of light transmitting elements and a corresponding array of lenses and an array of light receiving elements and a corresponding array of lenses. The light transmitting elements are each paired with a light receiving element and the light transmitting elements each transmit a beam of light energy towards the corresponding receiving element. The beams of light can be occluded by a web passing between the transmitting elements and the receiving elements, thereby reducing the light received by the receiving elements. The receiving elements can generate a signal that is proportional to the amount of they receive, and a controller can be used to determine the lateral position of an edge of the web in response to the signals generated by the receivers. A compensation light beam can be employed to enable the controller to compensate for several factors that can affect measurement accuracy.

Abstract: A method and system for determining the lateral position of an edge of a web are disclosed. The system includes a plurality of optical transmitters, a plurality of optical receivers, a plurality of ultrasonic transmitters, a plurality of ultrasonic receivers, and a controller. The controller is used to determine which type of transmitter and receiver should be used in conjunction with the specific web to be processed. The controller activates certain optical transmitters and determines the amount of optical occlusion that results from the web being between the optical transmitters and receivers. The controller also activates certain ultrasonic transmitters and determines the amount of sound occlusion that results from the web passing between the ultrasonic transmitters and receivers. The type of transmitter/receiver that results in the most occlusion can then be selected to determine the position of the edge of the web.

Abstract: A method and system for determining the lateral position of an edge of a web are disclosed. The system includes a plurality of optical transmitters, a plurality of optical receivers, a plurality of ultrasonic transmitters, a plurality of ultrasonic receivers, and a controller. The controller is used to determine which type of transmitter and receiver should be used in conjunction with the specific web to be processed. The controller activates certain optical transmitters and determines the amount of optical occlusion that results from the web being between the optical transmitters and receivers. The controller also activates certain ultrasonic transmitters and determines the amount of sound occlusion that results from the web passing between the ultrasonic transmitters and receivers. The type of transmitter/receiver that results in the most occlusion can then be selected to determine the position of the edge of the web.

Abstract: A method and system for determining the lateral position of an edge of a web are disclosed. The system includes an array of light transmitting elements and a corresponding array of lenses and an array of light receiving elements and a corresponding array of lenses. The light transmitting elements are each paired with a light receiving element and the light transmitting elements each transmit a beam of light energy towards the corresponding receiving element. The beams of light can be occluded by a web passing between the transmitting elements and the receiving elements, thereby reducing the light received by the receiving elements. The receiving elements can generate a signal that is proportional to the amount of they receive, and a controller can be used to determine the lateral position of an edge of the web in response to the signals generated by the receivers. A compensation light beam can be employed to enable the controller to compensate for several factors that can affect measurement accuracy.

Abstract: A method and system for determining the lateral position of an edge of a web are disclosed. The system includes an array of light transmitting elements and a corresponding array of lenses and an array of light receiving elements and a corresponding array of lenses. The light transmitting elements are each paired with a light receiving element and the light transmitting elements each transmit a beam of light energy towards the corresponding receiving element. The beams of light can be occluded by a web passing between the transmitting elements and the receiving elements, thereby reducing the light received by the receiving elements. The receiving elements can generate a signal that is proportional to the amount of they receive, and a controller can be used to determine the lateral position of an edge of the web in response to the signals generated by the receivers. A compensation light beam can be employed to enable the controller to compensate for several factors that can affect measurement accuracy.

Abstract: A method and system for determining the lateral position of an edge of a web are disclosed. The system includes an array of light transmitting elements and a corresponding array of lenses and an array of light receiving elements and a corresponding array of lenses. The light transmitting elements are each paired with a light receiving element and the light transmitting elements each transmit a beam of light energy towards the corresponding receiving element. The beams of light can be occluded by a web passing between the transmitting elements and the receiving elements, thereby reducing the light received by the receiving elements. The receiving elements can generate a signal that is proportional to the amount of they receive, and a controller can be used to determine the lateral position of an edge of the web in response to the signals generated by the receivers. A compensation light beam can be employed to enable the controller to compensate for several factors that can affect measurement accuracy.

Abstract: A method and system for guiding a web of moving material is disclosed. The system includes a plurality of variable light sources that can project light onto the surface of the web. One light source or a combination of light sources can be selected to project light onto the web, and the wavelength of the light can be selected. A light detector receives light reflected from the surface of the web and generates a data signal in response to the light received. A controller can be used to analyze the reflected light to determine the position of the web of moving material. The system enables the lateral and/or longitudinal position of various types of webs to be efficiently and effectively determined based upon the position of a line, edge, or other mark disposed on the surface of the web.

Abstract: An ultrasonic transducer unit for web edge detection includes multiple transducer elements attached to a single sound conducting plate. The transducer elements are preferably piezoelectric disks, and the sound conducting plate is preferably formed of hollow glass microspheres in an epoxy matrix. Multiple transducer elements may be positioned on the sound conducting plate in various geometric arrangements. Transducer units in accordance with the present invention may be mounted in a web edge detector head, such that pairs of transmitting and receiving transducer elements face each other across a detection gap through which a web of material is passed. Individual transducer elements within each transducer unit are activated to transmit/receive an ultrasonic beam in a selected pattern to provide both web edge sensing and ultrasonic signal compensation for varying ambient conditions in the detection gap.